ASUS PRIME B850-PLUS-CSM is the CSM (Corporate Stable Model) edition of the PRIME B850-PLUS, aimed at business deployments. This ATX AM5 board has the AMD B850 chipset, four DDR5 slots up to 256GB with ECC and non-ECC support, DisplayPort and HDMI output, Realtek 2.5Gb Ethernet and three M.2 slots, one running at PCIe 5.0 x4.
Product released: January 1, 2025
Latest firmware version
Version 1804, released September 21, 2026
Last checked for updates: Oct 31, 2026 06:27 UTC
What's new in version 1804
1. Update to AGESA ComboAM5 PI 1.3.0.1d.
2. Enhanced memory performance, system stability, and compatibility with CXMT memory chips for improved low-latency operation.
Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
LatestUpdate has tracked 16 versions of ASUS PRIME B850-PLUS-CSM firmware, released between March 4, 2025 and September 21, 2026.
Version 1804 - September 21, 2026: 1. Update to AGESA ComboAM5 PI 1.3.0.1d. 2. Enhanced memory performance, system stability, and compatibility with CXMT memory chips for improved low-latency op…
Version 1686 - July 2, 2026: Updated AGESA ComboAM5 PI 1.3.0.1b Patch A to support the GNR Transparent Secure Memory Encryption (TSME) feature. Before running the USB BIOS Flashback tool,…
Version 1681 - June 22, 2026: 1.Update AGESA ComboAM5 PI 1.3.0.1b. 2.Add support for EXPO ULL memory profiles. 3.Optimize ECC-UDIMM memory performance. Before running the USB BIOS Flashback…
Version 1670 - April 29, 2026: New memory profile support. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Version 1654 - April 27, 2026: "• Update AGESA ComboAM5 PI 1.3.0.1. Note: This BIOS version cannot be rolled back to previous versions. Before running the USB BIOS Flashback tool, please ren…
Version 1644 - March 23, 2026: "1. AGESA updated to ComboAM5 PI_1.3.0.0a. 2. Provide additional stability margin during high-frequency DDR5 training. 3. Addresses potential boot failures and…
Version 1642 - February 26, 2026: 1. AGESA updated to ComboAM5 PI_1.3.0.0a. 2. Provide additional stability margin during high-frequency DDR5 training. 3. Addresses potential boot failures and…
Version 1627 - February 11, 2026: "1. AGESA updated to ComboAM5 PI_Pre1.3.0.0 for better security. 2. Enhanced system performance and stability. 3. Improved memory compatibility for JEDEC-compl…
Version 1402 - November 26, 2025: "1.AGESA updated to ComboAM5 PI 1.2.7.0. 2.Improves compatibility with various CPUs and devices. Note: This BIOS version cannot be rolled back to previous vers…
Version 1087 - October 17, 2025: Updated AGESA to ComboAM5 PI 1.2.0.3g. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Version 1081 - September 19, 2025: Improve system stability. Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Version 1078 - August 1, 2025: 1.Updated AGESA to ComboAM5 PI 1.2.0.3f. 2.Enhanced system performance, stability, device compatibility, and overclocking support. Before running the USB BIOS…
Version 1065 - June 17, 2025: 1. Updated AGESA to ComboAM5 PI 1.2.0.3e for upcoming CPU compatibility. 2. Enhanced system performance and stability. 3. Important: This update is irreversibl…
Version 1028 - April 30, 2025: This update enhances compatibility with high-capacity memory modules and improves overall system performance. Before running the USB BIOS Flashback tool, pleas…
Version 1022 - March 7, 2025: 1. Enhanced system performance with support for 9950X3D and 9900X3D processors. 2. Included AI Cache Boost to enhance performance and compute power when using…
Version 0602 - March 4, 2025: First Release Before running the USB BIOS Flashback tool, please rename the BIOS file ( A5659.CAP) using BIOSRenamer.
Update prediction
A firmware update is expected soon, between October 8, 2026 and November 14, 2026.
ASUS typically releases firmware updates for this product approximately every 47 days.
ASUS PRIME B850-PLUS-CSM is the CSM (Corporate Stable Model) edition of the PRIME B850-PLUS, aimed at business deployments. This ATX AM5 board has the AMD B850 chipset, four DDR5 slots up to 256GB with ECC and non-ECC support, DisplayPort and HDMI output, Realtek 2.5Gb Ethernet and three M.2 slots, one running at PCIe 5.0 x4. It was originally released on January 1, 2025.
What is the latest firmware version of ASUS PRIME B850-PLUS-CSM?
The latest firmware version of ASUS PRIME B850-PLUS-CSM is 1804. It was released on September 21, 2026.
What changed in ASUS PRIME B850-PLUS-CSM firmware version 1804?
ASUS PRIME B850-PLUS-CSM firmware version 1804 includes the following changes: 1. Update to AGESA ComboAM5 PI 1.3.0.1d.
2. Enhanced memory performance, system stability, and compatibility with CXMT memory chips for improved low-latency operation.
Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer.
Where can I download the latest ASUS PRIME B850-PLUS-CSM firmware?
Details and download instructions for the latest ASUS PRIME B850-PLUS-CSM firmware (version 1804) are on ASUS's official release page: https://www.asus.com/motherboards-components/motherboards/csm/prime-b850-plus-csm/helpdesk_bios/
How often does ASUS release firmware updates for ASUS PRIME B850-PLUS-CSM?
We have tracked 16 firmware versions of ASUS PRIME B850-PLUS-CSM. Based on historical patterns, updates are released approximately every 47 days.
When is the next ASUS PRIME B850-PLUS-CSM firmware update expected?
Based on this product's update history, a firmware update for ASUS PRIME B850-PLUS-CSM is expected soon, between October 8, 2026 and November 14, 2026.
Is ASUS PRIME B850-PLUS-CSM still receiving firmware updates?
Yes, ASUS PRIME B850-PLUS-CSM received a firmware update within the last 3 months. The most recent version is 1804.